Anyone heard of cbxuuro.dll ?

Using Outpost Firewall, I keep getting cut off from the internet. The message says 'Network access for Firefox.exe was blocked because it's memory was modified by another process - WINLOGON.EXE'
I've found this cbxuuro.dll and it looks very suspicious. A quick Google revealed not one link! Have reported it and still waiting to hear back. Has anyone else come across this?